News Release

NYMEX to Change Margins for Financially Settled Electricity Futures Contracts

Wed Apr 04 2007

New York, N.Y., April 4, 2007 — The New York Mercantile Exchange, Inc. today announced margin changes for some of its financially settled electricity futures contracts on NYMEX ClearPort®, effective at the close of business tomorrow.

The margins for the first month of the Dow Jones North Path-15, Dow Jones Mid-Columbia, Dow Jones Palo Verde, and Dow Jones South Path-15 index swap electricity futures contracts will decrease to $9,000 from $10,000 for clearing members, to $9,900 from $11,000 for members, and to $12,150 from $13,500 for customers. The margins for all other months will remain unchanged.

Margins for the first to sixth months of the Cinergy Hub LMP peak electricity futures contract will remain the same. Margin rates for the seventh to 11th months will increase to $5,000 from $3,000 for clearing members, to $5,500 from $3,300 for members, and to $6,750 from $4,050 for customers. The margins for all other months will remain the same.

The margins for the first month of the Cinergy Hub LMP off-peak electricity futures contract will increase to $3,500 from $2,500 for clearing members, to $3,850 from $2,750 for members, and to $4,725 from $3,375 for customers. The margins for all other months will remain unchanged.

Margins for the Michigan Hub LMP off-peak electricity futures contract will increase to $3,500 from $3,000 for clearing members, to $3,850 from $3,300 for members, and to $4,725 from $4,050 customers.

The margin rates for the first month of the PJM Western Hub LMP off-peak electricity futures contract will increase to $5,000 from $4,000 for clearing members, to $5,500 from $4,400 for members, and to $6,750 from $5,400 for customers. The margins for all other months will remain the same.

Margins for the first month of the NYISO Zone A, NYISO Zone G, NYISO Zone J and ISO New England Internal Hub off-peak electricity futures contracts will decrease to $5,000 from $6,000 for clearing members, to $5,500 from $6,600 for members, and to $6,750 from $8,100 for customers. The margins for all other months will remain unchanged.

The margins for the first month of the ISO New England Internal Hub peak electricity futures contract will decrease to $8,500 from $9,500 for clearing members, to $9,350 from $10,450 for members, and to $11,475 from $12,825 for customers. The margins for all other months will remain the same.

Margins for the first month of the Northern Illinois Hub and AEP Dayton Hub peak electricity futures contract will decrease to $8,000 from $9,000 for clearing members, to $8,800 from $9,900 for members, and to $10,800 from $12,150 for customers. The margins for the second to sixth months will decrease to $6,000 from $7,000 for clearing members, to $6,600 from $7,700 for members, and to $8,100 from $9,450 for customers. Margins for the seventh to 11th months will decrease to $5,000 from $6,000 for clearing members, to $5,500 from $6,600 for members, and to $6,750 from $8,100 for customers. Margins for all other months will remain unchanged.

The margins for the first month of the Northern Illinois Hub off-peak electricity futures contract will increase to $5,000 from $3,000 for clearing members, to $5,500 from $3,300 for members, and to $6,750 from $4,050 for customers. The margins for all other months will remain unchanged.

The margins for the first month of the AEP Dayton Hub off-peak electricity futures contract will increase to $5,000 from $3,500 for clearing members, to $5,500 from $3,850 for members, and to $6,750 from $4,725 for customers. The margins for all other months will remain the same.

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Forward Looking and Cautionary Statements
This press release may contain forward–looking statements within the meaning of the Private Securities Litigation Reform Act, with respect to our future performance, operating results, strategy, and other future events. Such statements generally include words such as could, can, anticipate, believe, expect, seek, pursue, and similar words and terms, in connection with any discussion of future results. Forward–looking statements involve a number of assumptions, risks, and uncertainties, any of which may cause actual results to differ materially from the anticipated, estimated, or projected results referenced in forward–looking statements. In particular, the forward–looking statements of NYMEX Holdings, Inc., and its subsidiaries are subject to the following risks and uncertainties: the success and timing of new futures contracts and products; changes in political, economic, or industry conditions; the unfavorable resolution of material legal proceedings; the impact and timing of technological changes and the adequacy of intellectual property protection; the impact of legislative and regulatory actions, including without limitation, actions by the Commodity Futures Trading Commission; and terrorist activities and international hostilities, which may affect the general economy as well as oil and other commodity markets. We assume no obligation to update or supplement our forward–looking statements.

Contact: Steffanie Marchese, 212-299-2455 or  Keil Decker, 212-299-2209

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